Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-23
J.Phys.Conf.Ser.31:173-174,2006
Astronomy and Astrophysics
Astrophysics
Proceedings of The Third 21COE Symposium : Astrophysics as Interdisciplinary Science
Scientific paper
10.1088/1742-6596/31/1/039
We investigate the merging process in N-body self-gravitating system from the viewpoints of the local virial relation which is the relation between the local kinetic energy and the local potential. We compare both the density profile and the phase space density profile in cosmological simulations with the critical solutions of collisionless static state satisfying the local virial (LV) relation. We got the results that the critical solution can explain the characteristic density profile with the appropriate value of anisotropy parameter $\beta \sim 0.5$. It can also explain the power law of the phase space density profile in the outer part of a bound state. However, it fails in explaining the central low temperature part which is connected to the scale invariant phase space density. It can be well fitted to the critical solution with the higher value of$\beta \sim 0.75$. These results indicate that the LV relation is not compatible with the scale invariant phase space density in cosmological simulation.
Iguchi Osamu
Morikawa Masahiro
Nakamichi Akika
Sota Yasuhide
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